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Pollyanna Grows Up is a 1915 children's novel by Eleanor H. Porter. It is the first of many sequels to Porter's best-selling Pollyanna, but is the only one written by Porter herself; the numerous later additions to the Pollyanna franchise were the work of other authors.

A startling change in Aunt Polly's and Pollyanna's circumstances require Pollyanna to come up with a workable solution. Pollyanna's solution brings all her new friends from Boston and her old friends in Beldingsville together. Pollyanna also discovers she has to make a choice. Who will win her heart?